<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>

    <div id="app">
        <input @keyup.enter="fn" v-model="username" type="text">
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.7.16/dist/vue.js"></script>

    <script>
        const app=new Vue({
            el:"#app",
            data:{
                username:'',

            },
            methods: {
                fn (e) {
                    // if(e.key === 'Enter'){
                    //     console.log(this.username);
                    // }
                    //console.log(e);
                   console.log("触发键盘",this.username);
                }
            }
        })
    </script>
    
</body>
</html>